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In the 20th century, newer suburbs developed north of the Barada, and to some extent to the south, invading the Ghouta oasis.[citation needed] In 1956–1957, the new neighborhood of Yarmouk became a second home to many Palestinian refugees.[3] City planners preferred to preserve the Ghouta as far as possible, and in the later 20th century some of the main areas of development were to the north, in the western Mezzeh neighborhood and most recently along the Barada valley in Dummar in the northwest and on the slopes of the mountains at Barzeh in the north-east. Poorer areas, often built without official approval, have mostly developed south of the main city.